Originally from Coimbatore in Tamil Nadu, Sharat Prabhu, 28, was found unconscious in the bathroom by his roommate. Some syringes had been recovered from the spot.

Doctors at a nearby hospital declared him dead.

Prabhu was the first-year student of a postgraduate course in medicine of University College of Medical Sciences under the Guru Teg Bahadur Hospital.

His roommate told the police that Prabhu had spoken to his father on Tuesday night "and was fine and normal", a police officer said.

"When his roommate woke up, he found Prabhu unconscious. He informed the police and family members," he said.

The officer said: "Prima facie it appears he was injected insulin. We are trying to find out if he injected it himself or someone else did it."

The body has been sent for post-mortem.

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